We optically excite the electronic state 3s3p 3P0 in 24Mg atoms, laser cooled and trapped in a magic wavelength lattice. An applied magnetic field enhances the coupling of the light to the otherwise strictly
forbidden transition. We determine the magic wavelength, the quadratic magnetic Zeeman shift, and the
transition frequency to be 468.46(21) nm, −206.6(2.0) MHz/T2, and 655 058 646 691(101) kHz,
respectively. These are compared with theoretical predictions and results from complementary experiments. We also develop a high-precision relativistic structure model for magnesium, give an improved
theoretical value for the blackbody radiation shift, and discuss a clock based on bosonic magnesium.
A. P Kulosa, D. Fim, K. H. Zipfel, S. Rühmann, S. Sauer, N. Jha, K. Gibble, W. Ertmer, E. M. Rasel, M. S. Safronova, U. I. Safronova and S. G. Porsev, Towards a Mg Lattice Clock: Observation of the 1S0-3P0 Transition and Determination of the Magic Wavelength, Phys. Rev. Lett. 115, 240801 (2015)
